Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 10-02-2013, 08:03   #1
Registered User

Join Date: Jul 2012
Location: South Florida
Posts: 23
Yanmar Overheating

Yesterday, Yanmar 3GM30-93 (on 36' SV) overheated. We had been under power for 2 hrs, towing inflatable dinghy, headed into 20 knot winds with 4-6 foot building waves. Running at 2900-3000 rpm. Stopped, let cool. Checked everything. Oil, belts, leaks, etc. Nothing obvious. Impeller for water relaced last year. Approx 200 hrs on engine since then. I assume this was caused due to strain/resistance on engine. Restarted and powered to port at 2000 rpm (long, slow trip). No further overheating problem.
BUT, what else do/should I check to be sure all is OK? Any suggestions ate welcome. Thanks.
JEdward
__________________

__________________
JEdward is offline   Reply With Quote
Old 10-02-2013, 08:26   #2
Registered User
 
DennisM's Avatar

Join Date: Jan 2010
Location: New Paltz, NY
Boat: 1990 Ericson 32-200
Posts: 603
Images: 3
Send a message via Skype™ to DennisM
Re: Yanmar Overheating

I have a Yanmar 3GM30F. I run it at 2550-2600 for up to 10-12 hours a day when cruising. I've been told that running it at 2800 or above should only be done for short periods. I'm not an expert by any stretch of the imagination, so I offer that for what it's worth. I've never had an overheating problem, even in conditions a bit worse than what you describe.
__________________

__________________
DennisM is offline   Reply With Quote
Old 10-02-2013, 08:35   #3
Registered User

Join Date: Feb 2013
Location: Kemah, Texas
Boat: Nauticat 43, Hunter 170
Posts: 69
Re: Yanmar Overheating

Did you check the filter for the intake water? We sucked up some little shad once filling the filter trap and overheating the engine. Cleaning the filter was relatively easy, but we had to get to a marina to backflush the foot of line or so leading to the filter, which itself had clogged with fish.
__________________
Ded reckoner is offline   Reply With Quote
Old 10-02-2013, 08:42   #4
Registered User
 
jeremiason's Avatar

Join Date: Oct 2010
Location: Punta Gorda, Florida
Boat: Sea Ray 270
Posts: 1,427
Images: 2
Send a message via ICQ to jeremiason Send a message via Yahoo to jeremiason Send a message via Skype™ to jeremiason
Re: Yanmar Overheating

Check the obvious first, Sea Strainer and hoses. It sounds like you are back at the dock, so check water flow at the exhuast.

The less obivous are the impeller, which will sometimes fail at less than 200 hours and the heat exchanger, which could be getting some growth inside it, resisticting water flow at higher RPMs

With that said, if you were motoring into heavy seas, towing a dinghy, at high RPMs for that egnine, you probabaly over heated it from the drag on the boat.

I think the Max RPMs on that engine is 3200? So normally you would run no more than 80% of max RPM or about 2560 rpm.
__________________
Tom Jeremiason
Punta Gorda, Florida

jeremiason is offline   Reply With Quote
Old 10-02-2013, 08:53   #5
Moderator
 
HappyMdRSailor's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: North Mississippi
Boat: 48 Wauquiez Pilot Saloon-C22 Chrysler Sunpiper- 19 Potter-Preparing to cruise w/my girl
Posts: 5,980
Re: Yanmar Overheating

Definitely too much load caused by the conditions at that RPM, items to check have already been covered... Back off the throttle when you see it rising past where you are comfortable.... A circulating running diesel cools way faster than a stopped diesel...
__________________
In the harsh marine environment, something is always in need of repair...

Mai Tai's fix everything...
HappyMdRSailor is offline   Reply With Quote
Old 10-02-2013, 08:54   #6
Registered User
 
four winds's Avatar

Join Date: Oct 2010
Location: Wandering the US Gulf Coast
Boat: 78 Pearson323 Four Winds
Posts: 2,138
Re: Yanmar Overheating

Yes, the manual says full throttle for one hour max. Could have been so close to full throttle in those conditions for two hours, that caused the problem.

Seem to remember full time cruise RPM is around 2700, though not sure without looking. My personal limit on cruise RPM is 2500 for a 3gm30f.
__________________

__________________
Life begins at the waters edge.
four winds is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 21:16.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.